一个简单的清单 demo

Todoey

本 demo 特色功能：

1. Navigation Item Large Title
2. 多个视图继承自定义的 SwipeTableViewController (使用 SwipeCellKit 封装的可编辑 TableView)
3. realm 缓存数据到本地
4. 模糊搜索
5. 动态 cell 背景色优化
6. navigationBar 背景色优化
7. ChameleonFramework （变色龙Framework）使用

主要代码：

功能2：

SwipeTableViewController：

import UIKit
import SwipeCellKit

class SwipeTableViewController: UITableViewController, SwipeTableViewCellDelegate {
    
    var cell: UITableViewCell?

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.rowHeight = 80.0
    }

    // TableView Datasource Methods
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! SwipeTableViewCell
        cell.delegate = self
        return cell
    }

    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> [SwipeAction]? {
        
        guard orientation == .right else { return nil }
        let deleteAction = SwipeAction(style: .destructive, title: "Delete") { action, indexPath in
            // handle action by updating model with deletion
            self.updateModel(at: indexPath)
        }
        
        // customize the action appearance
        deleteAction.image = UIImage(named: "delete-icon")
        return [deleteAction]
    }
    
    func tableView(_ tableView: UITableView, editActionsOptionsForRowAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> SwipeTableOptions {
        var options = SwipeTableOptions()
        options.expansionStyle = .destructive
        return options
    }
    
    func updateModel(at indexPath: IndexPath) {
        // Update our data model.
        print("Item deleted from superclass")
    }

}

功能4：

extension TodoListViewController: UISearchBarDelegate {
    
    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        todoItems = todoItems?.filter("title CONTAINS[cd] %@", searchBar.text!).sorted(byKeyPath: "dateCreated", ascending: true)
        tableView.reloadData()
    }
    
    
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        if searchBar.text?.count == 0 {
            loadItems()
            DispatchQueue.main.async {
                searchBar.resignFirstResponder()
            }
        }
    }
}

功能6：

func updateNavBar(withHexCode colourHexCode: String){
        
        guard let navBar = navigationController?.navigationBar else {fatalError("Navigation controller does not exist.")}
        guard let navBarColour = UIColor(hexString: colourHexCode) else { fatalError()}
        navBar.barTintColor = navBarColour
        navBar.tintColor = ContrastColorOf(navBarColour, returnFlat: true)
        navBar.largeTitleTextAttributes = [NSAttributedString.Key.foregroundColor : ContrastColorOf(navBarColour, returnFlat: true)]
        searchBar.barTintColor = navBarColour
        
    }

功能7：

navBar.tintColor = ContrastColorOf(navBarColour, returnFlat: true)

方法 ContrastColorOf() 作用是根据背景色生成相应的黑色或白色。本例中 navBar 字体颜色根据 navBarColour 背景色的不同而生成或白或黑的颜色，提高视觉体验。比如背景色为黑色的时候，字体显示为白色，背景色为白色的时候，字体显示为黑色。

ContrastColorOf 方法具体注释：

Creates and returns either a black or white color object depending on which contrasts more with a specified color.
 
 - parameter backgroundColor: The specified color of the contrast color that is being requested.
 - parameter returnFlat:      Pass **true** to return flat color objects.
 
 - returns: A UIColor object in the HSB colorspace.

demo下载

参考：

1. Chameleon
2. Chameleon——轻量级 iOS 颜色框架